Machine for jointing- staves



UNITED STATES PATENT OFFICE.

JAMES F. BRISTOW AND ISAAC \V. BRISTONV, OF VEVAY, INDIANA.

MACHINE FOR JOINTING STAVES.

Specicaton of Letters Patent No. 28,962, dated July 3, 1860.

To all whom it may' concern:

Be it known that we, J AMES F. Bnis'row and Isaac IV. BRIs'row, of Vevay, in the county of Switzerland and State of Indiana, have invented certain new and useful Improvements in St-ave-Jointers; and we do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings, which form a part of this specification.

The nature of our invention consists in so vertical section.

A is a bottom framing from which two end posts B rise and these are connected by cross pieces B, and supported vertical from the back of the framing A by angularly placed posts C. Att-ached to the back cross pieces B between the posts B, B, is a piece D and at the top 0f the upright framing B, B, is a table E on which the knife can rest or be placed while the workman is changing the staves, taking one out of the machine and placing another therein. A piece a projects inward from B and on the top of B there runs along the whole length a pat-tern F of the curve which the joint is to take. This curve F is made of steel and is bent in at the ends to pass under a projecting piece Gr which is secured to the ends of the top of B and has a recess under it to accommodate the bent ends of F. These guides F are support-ed in their center by three screws S each having a slot in their heads sufficiently large to contain the width 0f F and these screws S pass through nuts e which rest on the sides of the slots f in the top of B.

Under the table E a. vibrating lever II is placed, and it is provided with two handles, one each side of the machine. In the center a bar L passes through it having a head g on its outer end, and to each of the pieces B it is connected by a toggle joint I secured to it by wedges K, and above one toggle joint there is a stop J secured to the frame, and a. similar stop J is secured below the other toggle joint I on the .opposite side of the ma chine. Through slots in the center of B, B, a piece M passes, having on its upper end a cross head M which is vnearly as long as the guide or former F and von each end of this cross head there are small supports O. The lower end of M rests on a. spring N.

Connected to the front of the framing A by screws (Z, provided with jam nuts o, and a piece R which is screwed to B is a framing P. This piece R is provided with two holes b o in which a pin on P can rest, and a -portion of R is bent at right angles and provided with a hole to pass on to Z and be clamped with the am nuts o. This piece R is the same .on both ends. The frame P is connected with the handles H by the bar L, and there are two springs L between the fra-mes P and B which tend to keep them apart. The bar L is secured to P -by a nut j which screws on to the threaded end of L. On th-e top Q of the frame P a guide F is attached in the same manner as F on the frame B by similar screws S and nuts e, and Q is also provided with slots f and end pieces G similar to G. The upper edge of Q projects inward at ce and the stave T is held between the parts aand a. The drawing knife or shave U is provided with a groove V which j enables it to lit on the top of either of the guides F or F, to prevent it from working on the edge of the guides and thereby losing its edge and becoming dull.

The operation of this machine is as follows: The stave T being put upon the supports Q on the cross head M and pressed down causes the piece M to descend in the slots in B B and compress the spring N which presses against the lower part of M. As the stave is depressed the end of the lever I-I, seen in the foreground in Fig. 1, `would be elevated, or if the workman was standing on the other side of the machine he would depress the handle on that side (say II) and the eifect of either of these motions would be that the toggle joints I would be brought into a perfectly horizontal position, and prevented from moving therefrom by the stops J, and so would throw the double leve-r I-I to its greatest distance from the vertical posts or framing B, B. Now as we have be fore stated the center of I-I is pivoted or has running through it a rod L provided with a.

head g and that passes through a cross piece B and through the framing P to which it is secured by a nut j, so that when the lever H is operated as we have above described, and thrown its farthest from B then the framing P and the projection a thereon will be brought correspondingly near to the projection a on the framing B and thus the two projections a and a will act as jaws and clamp the stave tightly between them.`

When on the other hand, by a reverse motion of the lever H, that is, of either handle of it, the toggle joints I are bent up and down and H is brought closer to the frame B, and the springs L press out the frame P and allowing the spring N to act, it forces up the piece M, cross-head M and supports O and so ejects the stave T. In the operation of cutting the curve on the stave, it is of course very important that each side should be parallel to each other or else the barrel when made up will not be tight or have the proper shape. By this arrangement of the chamfering tool, and the stave resting on two supports which are connected rigidly to a crosshead which is moved or held on one center this parallelism is always insured and the stave always made the proper shape.

Having described the operation of holding and releasing the stave we will now proceed to explain the method of cutting it.

The stave T being secured or clamped between a and a the knife U is laid with either of the guides F or F in its groove V and being drawn along` of course cuts the stave of the proper curve, exactly similar to the one on F and F If a greater or less bilge is required this can be attained by manipulating the nuts e and raising or depressing the screws S and thus changing at once the shape of the curve. To eectthe cutting of a proper chamfer on the side of the stave the frame P is slightly lower than the frame B, and by means of theV clamp or jam nuts c on the screw cl it can be raised or lowered to give a greater or less angle tothe chamfer of the stave as required. This can also be e'ected by moving F and F farther from or closer to each other by lloosening the nuts e and allowing the guides to be moved as desired, the ends sliding under the projecting pieces G and G and the screws S in the slots f in the heads of their respective frames, and thus larger, that is wider, or narrower staves can have a greater or less chamfer given them to form barrels of the same size. The knife being pressed on the guides can of course only cut to the depth and angle which they allow. In case of the staves being thicker provision is made for their perfect clamping while being cut. The nut j can be loosened and also the clamp or jam nuts o on CZ and the pin alluded to in the description which is in the side of P, passed into the eXtreme of the two holes I) in the connection R, thus placing the clamping surfaces a farther from a and allowing a much thicker stave to be introduced. The jam nuts on d being again screwed to their proper position and the nut on L having been made to tighten the springs L sufliciently, the lever Il with its handles when operated as before described will clamp the stave between the frames B and P while it is being cut. When one side of the stave is properly finished it is released, and turned over, the finished side resting on the projections O and thus insuring the curve and chamfer being perfectly parallel with it when cut on the other side. The groove V in the knife guides the knife perfectly and as there is no obstruction to its progress, the heads of the screws S in which the guides rest not reaching quite to the top of the guides the stave can be cut in either direction to accommodate the grain of the wood. It is apparent that were the knife to cut with only one portion of its edge it would quickly become dull in that plane and the whole knife have to be reground and sharpened to keep that one place sharp by being able to move the guides F and F closer to and farther from the stave, still however maintaining their relative position the one to the other, that the whole edge of the knife may be used as a cutting edge and every portion of it made to do its share of work.

Having thus fully described our invention what we claim and desire to secure by Let-- ters Patent is as follows:

1. The guides F F, stops O, crosshead M vert-ical piece M and spring N arranged substantially as and for the purposes set forth.

2. The vibrating lever H links I, stops J, boltL and springs L for operating frame P and clamping the stave substantially as described.

3. The groove V in the knife U, to act as a guide and prevent it becoming dull by passing over the guides F and F as set forth.

JAMES F. Binsfrow. IsAAc w. BRisTow.

Witnesses:

SAMUEL B. MILLER, FRED. L. CoURvoIsIER. 

